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2fadfa51ec
- Removing need for alignment in audio DSP. - Decreased header dependencies across codebase to improve build times - Fixed improper `using namespace` issues. #jira UE-147590 #rb Helen.Yang, Alfaroh.Corneyiii #preflight 62a789bd2c521c9c6dac7bb6 [CL 20648535 by phil popp in ue5-main branch]
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "DSP/Dsp.h"
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#include "DSP/FloatArrayMath.h"
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namespace Audio
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{
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void EncodeMidSide(
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const FAlignedFloatBuffer& InLeftChannel,
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const FAlignedFloatBuffer& InRightChannel,
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FAlignedFloatBuffer& OutMidChannel,
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FAlignedFloatBuffer& OutSideChannel)
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{
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const int32 LeftInNumElements = InLeftChannel.Num();
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const int32 RightInNumElements = InRightChannel.Num();
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const bool bInputChannelsEqual = LeftInNumElements == RightInNumElements;
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const bool bOutputChannelsBigEnough = (OutMidChannel.Num() >= LeftInNumElements) && (OutSideChannel.Num() >= LeftInNumElements);
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if (!bInputChannelsEqual || !bOutputChannelsBigEnough)
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{
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return;
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}
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OutMidChannel.Reset(LeftInNumElements);
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OutSideChannel.Reset(LeftInNumElements);
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OutMidChannel.AddUninitialized(LeftInNumElements);
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OutSideChannel.AddUninitialized(LeftInNumElements);
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ArraySubtract(InLeftChannel, InRightChannel, OutSideChannel);
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//Output
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ArraySum(InLeftChannel, InRightChannel, OutMidChannel);
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}
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void DecodeMidSide(
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const FAlignedFloatBuffer& InMidChannel,
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const FAlignedFloatBuffer& InSideChannel,
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FAlignedFloatBuffer& OutLeftChannel,
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FAlignedFloatBuffer& OutRightChannel)
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{
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const int32 LeftInNumElements = InMidChannel.Num();
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const int32 RightInNumElements = InSideChannel.Num();
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const bool bInputChannelsEqual = LeftInNumElements == RightInNumElements;
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const bool bOutputChannelsBigEnough = (OutLeftChannel.Num() >= LeftInNumElements) && (OutRightChannel.Num() >= LeftInNumElements);
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if (!bInputChannelsEqual || !bOutputChannelsBigEnough)
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{
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return;
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}
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OutLeftChannel.Reset(LeftInNumElements);
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OutRightChannel.Reset(LeftInNumElements);
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OutLeftChannel.AddUninitialized(InMidChannel.Num());
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OutRightChannel.AddUninitialized(InSideChannel.Num());
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// Calculate the average value between the two signals at each sample
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const float AverageScale = 0.5f;
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ArrayWeightedSum(InMidChannel, AverageScale, InSideChannel, AverageScale, OutLeftChannel);
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ArraySubtract(InMidChannel, InSideChannel, OutRightChannel);
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ArrayMultiplyByConstantInPlace(OutRightChannel, AverageScale);
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}
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}
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